Add the 5 buttons connected to a resistor laddered matrix and sampled by the SAR ADC channel 0.
Only the p200 board has these buttons, the P201 doesn't. Signed-off-by: Neil Armstrong <narmstr...@baylibre.com> --- arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts | 50 +++++++++++++++++++++++++ 1 file changed, 50 insertions(+) This patch depends on Martin Blumenstingl's sar adc patchset at [1]. [1] http://lkml.kernel.org/r/20170115224221.15510-1-martin.blumensti...@googlemail.com diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts index af7b151..3051cc8 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts @@ -45,6 +45,7 @@ /dts-v1/; #include "meson-gxbb-p20x.dtsi" +#include <dt-bindings/input/input.h> / { compatible = "amlogic,p200", "amlogic,meson-gxbb"; @@ -58,6 +59,50 @@ */ linux,usable-memory = <0x0 0x1000000 0x0 0x3f000000>; }; + + avdd18_usb_adc: regulator-avdd18_usb_adc { + compatible = "regulator-fixed"; + regulator-name = "AVDD18_USB_ADC"; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + + adc_keys { + compatible = "adc-keys"; + io-channels = <&saradc 0>; + io-channel-names = "buttons"; + keyup-threshold-microvolt = <1800000>; + + button-home { + label = "Home"; + linux,code = <KEY_HOME>; + press-threshold-microvolt = <900000>; /* 50% */ + }; + + button-esc { + label = "Esc"; + linux,code = <KEY_ESC>; + press-threshold-microvolt = <684000>; /* 38% */ + }; + + button-up { + label = "Volume Up"; + linux,code = <KEY_VOLUMEUP>; + press-threshold-microvolt = <468000>; /* 26% */ + }; + + button-down { + label = "Volume Down"; + linux,code = <KEY_VOLUMEDOWN>; + press-threshold-microvolt = <252000>; /* 14% */ + }; + + button-menu { + label = "Menu"; + linux,code = <KEY_MENU>; + press-threshold-microvolt = <0>; /* 0% */ + }; + }; }; &i2c_B { @@ -65,3 +110,8 @@ pinctrl-0 = <&i2c_b_pins>; pinctrl-names = "default"; }; + +&saradc { + status = "okay"; + vref-supply = <&avdd18_usb_adc>; +}; -- 1.9.1
